OPening session failed...

Hi everybody,

First, sorry for my english but I will try to talk about my problem.
I have 2 domains to manage:
- @example.com with external LDAP authentification.
- @it.example.com with external LDAP authentification.

I created them with the zimbra admin console and I test the authentification and everything was successful!

When I created Accounts for the domain @example and tested them, everything was OK.
But for the domain @it.example.com, the authentification is successful but I have immediately the following message "Your session has expired". But the account is valid because I can use it for my samba domain.

Tell me if you need more explanations and thank in advance for your answords...